Month guide · Kauaʻi · United States
Kauaʻi in September
What September is really like in Kauaʻi: weather, crowds, prices, events and what to pack.
Updated By the AMZBooking editorial team
Pictured: Kōkeʻe State Park and Kalalau Lookout, Kauaʻi · Photo: Gh5046 at English Wikipedia, Public domain
Quick answer
September is one of the best months to visit Kauaʻi. Expect average highs of 30°C (86°F), lows of 23°C (73°F), about 13 rainy days and roughly 12.2 hours of daylight. Quieter after the summer holidays, with warm seas and lower prices.
Key facts
- Average high / low
- 30°C (86°F) / 23°C (73°F)
- Rainy days
- About 13
- Daylight
- About 12.2 hours
- Sea temperature
- 27°C (81°F)
- Crowds
- Quiet
- Hotel prices
- Average
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Weather in September
September is the 2nd-warmest month in Kauaʻi: days average 30°C (86°F) against a yearly average high of 28°C (82°F), and nights fall to about 23°C (73°F). Rain falls on roughly 13 of its 30 days. Compared with August (30°C (86°F)), September is about as warm; by October highs stay near 29°C (84°F).
- Sunrise (15 September)
- About 06:25
- Sunset (15 September)
- About 18:41
- Daylight
- About 12.2 hours
- Sea
- 27°C (81°F)
Summer (June–August). Drier, warmest weather with calm seas, the best Nā Pali boat conditions and the busiest family season.
Crowds and prices
On a 1–5 scale, September rates 2 for crowds (the peak is July at 5) and 3 for hotel prices (highest in January). Prices sit in the middle of the year's range.
Events in September
September has no major recurring festival in Kauaʻi, which usually means easier bookings.
What to do in September
With frequent rain, plan around indoor sights and keep outdoor time flexible.
Viewpoint · Princeville
Hanalei Valley Lookout
Stop in the late afternoon, when the light picks out the taro patches, and look for endangered nēnē geese and wetland birds.
- Time needed
- 15 minutes
- Cost
- Free
- Free
- Views
- Photo spot
- Nature
Beach · Poʻipū and Kōloa
Poʻipū Beach Park
A sandy beach split by a tombolo, with a lifeguard tower, a rock-sheltered children's pool and good snorkelling around the reef.
- Time needed
- Half a day
- Cost
- Free
- Free
- Kids
- Nature
- Outdoors
Viewpoint · Poʻipū and Kōloa
Spouting Horn
Visit when the surf is up for the biggest spouts, and keep behind the railings; the lava shelf is very dangerous.
- Time needed
- 30 minutes
- Cost
- Free
- Free
- Kids
- Nature
- Photo spot
Garden · Lāwaʻi
Allerton and McBryde Gardens
The National Tropical Botanical Garden manages these neighbouring gardens in the Lāwaʻi Valley.
- Time needed
- 2.5–3 hours
- Cost
- Expensive
- Nature
- Couples
- Photo spot
- History
The sea averages 27°C (81°F) — warm enough to swim. Best beaches near Kauaʻi.
What to pack
For highs near 30°C (86°F), lows near 23°C (73°F) and 13 wet days: light, breathable clothes, a sun hat and high-factor sunscreen; a compact umbrella and waterproof shoes — rain is frequent; comfortable walking shoes.
Is September a good time to visit Kauaʻi?
One of the best months to visit Kauaʻi. The other best months are April–June and October. Compare every month.
Kauaʻi in other months
Questions travellers ask
+What time does the sun set in Kauaʻi in September?
At about 18:41 local time in mid-September, with sunrise at about 06:25: roughly 12.2 hours of daylight.
+How warm is Kauaʻi in September?
Average highs are around 30°C (86°F) and lows around 23°C (73°F).
+Does it rain a lot in Kauaʻi in September?
Expect rain on about 13 days of the month, so pack for wet weather.